Potential $114 Million Loss in Coldcard Wallets as Fourth Sweep Suspected

Recent activity in the blockchain mempool indicates a series of transactions associated with Coldcard wallets that may constitute a fourth security sweep. These transactions are marked by replace-by-fee (RBF) signals, which enable users to increase transaction fees to expedite processing. Anyone who notices their address in the mempool has a limited window—just minutes—to pay a higher fee and move their funds before they could be potentially compromised.

The suspected sweep has raised concerns within the crypto community, as the total estimated losses could approach $114 million, depending on the extent of the affected addresses and the amount of funds involved. Coldcard, a hardware wallet known for its security features, has not yet issued a formal statement regarding the ongoing activity.

Security experts emphasize the importance of promptly monitoring wallet activity and adjusting transaction fees accordingly to mitigate potential losses. The situation underscores the ongoing risks associated with crypto asset security and the need for vigilant transaction management, especially during periods of suspicious activity.

While the precise origin and intent behind these transactions remain unclear, the pattern suggests a coordinated effort to drain or consolidate funds from affected wallets. The crypto ecosystem continues to watch for further developments and official updates from Coldcard and security authorities.